Lab 4
Copy your lab1 folder, and call the copy lab4
1. Open the image, ball.bmp, using the GIMP software
2. Choose the 'Select contiguous regions' tool, and click the blue background.
This selects the area that we want to eventually tell the computer to ignore, allowing transparency.
3. Right click the selected blue area, then choose Layer\Transparency\Add Alpha Channel.
(You can also select the Layer menu, then choose Transparency\Add Alpha Channel)
4. Select the Eraser tool, which can now be used to erase the blue, leaving the gray checkerboard that indicates
transparency
5. Now to save the file, using File\Save As...
6. Choose the gif file type, and name the file lab4.gif
7. The GIMP software warns that the file must be exported, a step to convert the information to meet the 256 color limit
8. You may leave a comment, this will not display.
• Zip the lab4 folder, rename it to yourname-lab4.zip and submit in the D2L Lab 4 dropbox
Answer the following questions
The GIMP when started opens ____ window(s).
a) 1
b) 2
c) 3
d) 256
True or False
When you use the GIMP window to open a file, the image opens in a new window
a) true
b) false
Match the commands with menu the command is found on in the GIMP
Edit menu
File menu
Image menu
Select menu
Tools menu
Select\None command
Copy command
brightness-contrast command
Save As command
Image Crop command
On TV, the weather person used a process called ________ to appear to stand in front of a map
a) alpha channel
b) animation
c) chroma key
d) layers
Iin gif files, the hiding of an area or color, using a(n) ________ , can create transparency
a) alpha channel
b) animation
c) chroma key
d) layers
Another method that can create transparency is to add the equivalent of clear plastic over the image, these clear sheets are
called
a) alpha channels
b) animations
c) chroma keys
d) layers